Concrete vibrator



Aug. 23, 1955 H. E. WILSON CONCRETE VIBRATOR Filed Sept. 15, 1953 Harold E. Wilson INVENTOR.

BY min way 5m United States Patent "ice 2,716,022 CONCRETE VIBRATOR 1 Harold E. Wilson, Topeka, Kans.

Application September 15, 1953, Serial No. 380,156

3 Claims. (Cl. 259-1) This invention relates to concrete vibrators and more particularly to a device for settling and removing air from concrete during the process of pouring forms in constructions of buildings, etc.

An object of this invention is to provide a concrete vibrator which is adapted to compact concrete and thin semi-fluid masses which are poured into forms.

Another object of this invention is to provide a concrete vibrator which is long and thin so that it may be inserted and withdrawn between the metal structural members of reinforcing bars in a concrete form.

A further object of this invention is to provide a concrete vibrator which is electrically driven and which is provided with control means positioned remote from the vibrator.

A still further object of this invention is to provide a concrete vibrator having a reinforced cable connecting the vibrator to the control means.

A still further object of this invention is to provide a concrete vibrator having a plurality of electrical magnets mounted within a casing, which magnets activate a clapper within the casing.

A yet further object of this invention is to provide a concrete vibrator which is simple and efficient in construction, and durable and lasting in use.

These together with other objects and advantages which will become subsequently apparent reside in the details of construction and operation as more fully hereinafter described and claimed, reference being had to the accompanying drawings forming a part hereof, wherein like numerals refer to like parts throughout, and in which:

Figure 1 is a schematic view partly in elevation and partly in section showing the concrete vibrator forming the subject of this invention embedded in a mass of concrete;

Figure 2 is a fragmentary sectional view of one form of the concrete vibrator forming the subject of this invention; and,

Figure 3 is a sectional view taken substantially on section line 3-3 of Figure 1.

Referring now more particularly to the accompanying drawing it will be seen that the improved concrete vibrator forming the subject of this invention includes, as shown in Figure 1, a casing embedded in a mass of concrete 12 which is disposed in a form 14. The casing 10 is connected by means of cable 16 to a control means 18. The control means 18 is positioned at a point remote from the casing 10.

In the embodiment shown in Figure 2, the casing 10 is provided with a plurality of electromagnets 20, 22, 24 and 26. The magnets 20 and 22 are disposed inside the casing 10 adjacent one end thereof at diametrically opposite points. The magnets 24 and 26 are disposed inside the casing 10 adjacent the other end thereof at diametrically opposite points. The magnets 20 and 24 are longitudinally aligned on one side of the casing 10 7 and the magnets 22 and 26 are longitudinally aligned on the other side of the casing 10.

2,716,022 Patented Aug. 23, 1955 The casing 10 is further provided with a pin 28 extending transverse to the plane through the magnets. The pin 28 is positioned midway between all of the magnets. A bar 30 is pivotally mounted at the midpoint thereof on the pin 28. One end of rod 30 is positioned between the magnets 20 and 22 and the other end of the bar 30 is positioned between the magnets 24 and 26. The bar 30 is movable between a position engaging the magnets 20 and 26 and a position engaging the magnets 22 and 24.

The magnets 20 and 26 are energized simultaneously and the magnets 22 and 24 are energized simultaneously. Control means 18 are provided for alternately energizing the pairs of magnets. This means comprises a plate 32 positioned on the control means 18. The plate 32 is provided with a plurality of contact points which have been indicated at 1, 2, 3 and 4 in Figure 3. An electricity conductor 34 connects each one of the contacts with one of the magnets. The magnet 20 being connected to the contact 1, magnet 22 being connected to contact 2, magnet 24 to contact 3 and magnet 26 being connected to contact 4.

A shaft 36 is mounted for rotation at the center of the plate 32 midway between the contacts 1, 2, 3 and 4. The shaft 36 is driven by a suitable electric motor mounted in the control means 18. A commutator bar 38 is secured on the end of the shaft 36 for rotation therewith. The contacts 1 and 4 are positioned at diametrically opposite points on the blade 32 and the contacts 2 and 3 are likewise positioned at diametrically opposite points on the plate 32. The bar 38 is provided with opposite ends which can engage contacts 1 and 4 simultaneously or contacts 2 and 3 simultaneously. As the shaft 36 is rotated the bar 38 will alternately engage contacts 1 and 4 and contacts 2 and 3.

A live lead 40 is connected to a member 42 which slidably engages the hub portion of bar 38. Electricity from the lead 40 passes through the member 42 to the bar 38 and thence to the contacts and through the conductors 34 to the magnets. Thus when the bar 38 is rotated the pairs of magnets will be alternately energized causing the bar 30 to swing back and forth between the pairs of magnets. This will cause a vibration of the casing 10 which will settle and force the air from the liquid concrete.

A ground wire 44 leads from the casing 10 to the control means 18 and back through the line 46 which supplies the electricity to the control means 18. The control means 18 is further provided with a handle 48 for supporting the control means.

In practical use, the casing 10 will be inserted into the wet cement and the current supplied to the control means 18. As the current flows to the casing 10 the bar 30 will be actuated thereby causing vibration of the casing 10. This vibration will cause the wet concrete to settle and will also force the air from the concrete.

From the foregoing, the construction and operation of the device will be readily understood and further explanation is believed to be unnecessary. However, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the invention to the exact construction shown and described, and accordingly all suitable modifications and equivalents may be resorted to, falling within the scope of the appended claims.

What is claimed as new is as follows:

1. A concrete vibrator comprising a casing adapted to be inserted into wet concrete, means for producing a magnetic field along the inner walls of said casing, means actuated by said field within said casing causing vibration 0 of said casing, and means for supplying electricity to said named means being disposed between said first pair of magnets and between said second pair of magnets.

2. The combination of claim 1 wherein said second named means comprises a longitudinal member, said member being pivotally mounted in said casing, said member being pivotal about the midpoint thereof and movable between a position wherein the ends of said member engage said first pair of magnets to a position 15 wherein the ends of said member engage the second pai of magnets.

3. The combination of claim 2 wherein said third named means comprises a plurality of electricity conductors connected at one end to said magnets, and means connected to the other ends of said conductors for alternately supplying electricity to said conductors, said means comprising a commutator positioned remote from said casing.

References Cited in the file of this patent UNITED STATES PATENTS 1,886,401 Jackson Nov. 8, 1932 2,142,237 Canady Jan. 3, 1939 FOREIGN PATENTS 750,956 France Aug. 24, 1932 

